User manual

Publication 1756-RM093F-EN-P - January 2010 61
Safety Application Development Chapter 6
Downloading the Safety
Application Program
Upon download, full application testing is required unless a safety
task signature exists.
Downloads to a safety-locked GuardLogix controller are allowed only
if the safety task signature, the hardware series, and the OS version of
the offline project all match those contained in the target GuardLogix
controller and the controller’s safety task status is OK.
Uploading the Safety
Application Program
If the GuardLogix controller contains a safety task signature, the safety
task signature will be uploaded with the project. This means that any
changes to offline safety data will be overwritten as a result of the
upload.
Online Editing
If there is no safety task signature and the controller is
safety-unlocked, you can perform online edits to your safety routines.
Pending edits cannot exist when the controller is safety-locked or
when there is a safety task signature. Online edits may exist when the
controller is safety-locked. However, they may not be assembled or
cancelled.
See page 63
for more information on making edits to your application
program.
IMPORTANT
To verify the integrity of every download, you must manually
record the safety task signature after initial creation and check
the safety task signature after every download to make sure
that it matches the original.
IMPORTANT
If the safety task signature does not match and the controller is
safety-locked, you must unlock the controller to download.
Downloading to the controller deletes the safety task signature.
As a result, you must re-validate the application.
TIP
You cannot edit standard or safety Add-On Instructions while
online.
TIP
Online edits in standard routines are unaffected by the
safety-locked or -unlocked state.